An undercover cop insinuates himself into a yakuza family. Managing to avert an assassination attack on the boss he is assigned to kill a rival boss.

An undercover cop befriends a yakuza underling who through his contacts helps him infiltrate two rival Yakuza gangs. He pits the two rival gangs against each other in hopes that they will cross each other out.

Detective Hayata's friend is killed by criminals. In order to find the murder, Hayata infiltrate a gang, with the aim of getting closer to the big bosses responsible for the murder

Exciting fights between the police and a crime syndicate over the secret of poison gas.